Reponses of soil microbial catabolic diversity to arbuscular mycorrhizal inoculation and soil disinfection
2007
Dabire, A.P. | Hien, V. | Kisa, M. | Bilgo, A. | Sangare, K.S. | Plenchette, Christian | Galiana, A. | Prin, Yves | Duponnois, Robin | Institut de Recherche pour le Développement (IRD) | Centre national de la recherche scientifique et technologique [Ouagadougou] (CNRST) | Biologie et Gestion des Adventices (BGA) ; Etablissement National d'Enseignement Supérieur Agronomique de Dijon (ENESAD)-Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB) | Acteurs, Ressources et Territoires dans le Développement (UMR ART-Dev) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université Paul-Valéry - Montpellier 3 (UPVM)-Université de Perpignan Via Domitia (UPVD)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) | Laboratoire Commun de Microbiologie IRD/ISRA/UCAD ; Institut de Recherche pour le Développement (IRD)
International audience
Mostrar más [+] Menos [-]Inglés. Although it is usually admitted that arbuscular mycorrhizal (AM) fungi are key components in soil bio-functioning, little is known on the response of microbial functional diversity to AM inoculation. The aims of the present study were to determine the influence of Glomus intraradices inoculum densities on plant growth and soil microflora functional diversity in autoclaved soil or non-disinfected soil. Microbial diversity of soil treatments was assessed by measuring the patterns of in situ catabolic potential of microbial communities. The soil disinfection increased sorghum growth, but lowered catabolic evenness (4.8) compared to that recorded in the non-disinfected soil (6.5). G. intraradices inoculation induced a higher plant growth in the autoclaved soil than in the non-disinfected soil. This AM effect was positively related to inoculum density. Catabolic evenness and richness were positively correlated with the number of inoculated AM propagules in the autoclaved soil, but negatively correlated in the non-disinfected soil. In addition, after soil disinfection and AM inoculation, these microbial functionality indicators had higher values than in the autoclaved or in the non-disinfected soil without AM inoculation. These results are discussed in relation to the ecological influence of AM inoculation, with selected fungal strains and their associated microflora on native soil microbial activity
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